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	<title>YUI Library Examples: Drag &amp; Drop: Drag and Drop - Resizable Panel</title>
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    #dd-panel {
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        height: 200px; 
        width: 150px;
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        background-color: #f7f7f7;
    }

    #dd-resize-handle {
        cursor: se-resize;
        position: absolute; 
        bottom: 0px; 
        right: 0px; 
        width: 10px; 
        height: 10px;
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        font-size: 1px;
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	<div id="pagetitle"><h1>YUI Library Examples: Drag &amp; Drop: Drag and Drop - Resizable Panel</h1></div>
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		  <div class="yui-ge">
			  <div class="yui-u first example">
	
	<div class="promo">
	<h1>拖放：拖放 - 可调整大小的面板</h1>
	
	<div class="exampleIntro">
	<p>该实例展示了使用 <a href="http://developer.yahoo.com/yui/dragdrop/">拖放</a> 实现可拖拉面板的一种方法。（<strong>注意</strong>：UI控件的 <a href="http://developer.yahoo.com/yui/container/">Container Family</a> 包含的 <a href="../container/panel-resize.html">Panel Resize Example</a> 中也提供了一种创建可拖拉面板的有效方法。）</p>

			
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			<div class="hd exampleHd">
			<p class="newWindowButton yui-skin-sam"><!--<span id="newWindowLinkx"><span class="first-child">--><a href="dd-resize_clean.html" target="_blank">在新窗口中查看实例</a><!--</span></span>-->		
		</div>		<div id="example-canvas" class="bd">
	
		
	<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
	
	<div id="dd-panel">
    <div id="dd-resize-handle"></div>
</div>

<script type="text/javascript">

YAHOO.example.DDResize = function(panelElId, handleElId, sGroup, config) {
    YAHOO.example.DDResize.superclass.constructor.apply(this, arguments);
    if (handleElId) {
        this.setHandleElId(handleElId);
    }
};

YAHOO.extend(YAHOO.example.DDResize, YAHOO.util.DragDrop, {

    onMouseDown: function(e) {
        var panel = this.getEl();
        this.startWidth = panel.offsetWidth;
        this.startHeight = panel.offsetHeight;

        this.startPos = [YAHOO.util.Event.getPageX(e),
                         YAHOO.util.Event.getPageY(e)];
    },

    onDrag: function(e) {
        var newPos = [YAHOO.util.Event.getPageX(e),
                      YAHOO.util.Event.getPageY(e)];

        var offsetX = newPos[0] - this.startPos[0];
        var offsetY = newPos[1] - this.startPos[1];

        var newWidth = Math.max(this.startWidth + offsetX, 10);
        var newHeight = Math.max(this.startHeight + offsetY, 10);

        var panel = this.getEl();
        panel.style.width = newWidth + "px";
        panel.style.height = newHeight + "px";
    }
});

(function() {
    var dd, dd2, dd3;
    YAHOO.util.Event.onDOMReady(function() {
        // put the resize handle and panel drag and drop instances into different
        // groups, because we don't want drag and drop interaction events between
        // the two of them.
        dd = new YAHOO.example.DDResize("dd-panel", "dd-resize-handle", "panelresize");
        dd2 = new YAHOO.util.DD("dd-panel", "paneldrag");

        // addInvalidHandleid will make it so a mousedown on the resize handle will 
        // not start a drag on the panel instance.  
        dd2.addInvalidHandleId("dd-resize-handle");
    });
})();
</script>
	
	<!--END SOURCE CODE FOR EXAMPLE =============================== -->
	
		
		</div>
		
	
	</div>			
	</div>
		
	<h2 class="first">Basic Drag and Drop</h2>

<p><a href="http://developer.yahoo.com/yui/dragdrop/">YUI 拖放</a> 功能允许你将HTML元素可拖放化。</p>

<p>在这个实例中，灰白色的方型区域是可拖放的 <code>YAHOO.util.DD</code> 实例。 
   在右下脚安置了一个的蓝色小方块，因此我们用 <code>YAHOO.util.DragDrop</code> 来取代
    <code>YAHOO.util.DD</code> 实现调整大小的操作。This is because
    我们只希望通过跟踪拖放过程中的坐标来调整面板的大小。  
    我们不希望重新配置调整大小的操作（我们在调整面板大小的过程中，它会自己重新设置）。</p>

<p>Markup:</p>

<textarea name="code" class="JScript" cols="60" rows="1">

<div id="dd-panel">
    <div id="dd-resize-handle"></div>
</div>

</textarea>

<p>Code:</p>

<textarea name="code" class="JScript" cols="60" rows="1">

<script type="text/javascript">

YAHOO.example.DDResize = function(panelElId, handleElId, sGroup, config) {
    YAHOO.example.DDResize.superclass.constructor.call(this, panelElId, sGroup, config);
    if (handleElId) {
        this.setHandleElId(handleElId);
    }
};

YAHOO.extend(YAHOO.example.DDResize, YAHOO.util.DragDrop, {

    onMouseDown: function(e) {
        var panel = this.getEl();
        this.startWidth = panel.offsetWidth;
        this.startHeight = panel.offsetHeight;

        this.startPos = [YAHOO.util.Event.getPageX(e),
                         YAHOO.util.Event.getPageY(e)];
    },

    onDrag: function(e) {
        var newPos = [YAHOO.util.Event.getPageX(e),
                      YAHOO.util.Event.getPageY(e)];

        var offsetX = newPos[0] - this.startPos[0];
        var offsetY = newPos[1] - this.startPos[1];

        var newWidth = Math.max(this.startWidth + offsetX, 10);
        var newHeight = Math.max(this.startHeight + offsetY, 10);

        var panel = this.getEl();
        panel.style.width = newWidth + "px";
        panel.style.height = newHeight + "px";
    }
});

(function() {
    var dd, dd2, dd3;
    YAHOO.util.Event.onDOMReady(function() {
        // put the resize handle and panel drag and drop instances into different
        // groups, because we don't want drag and drop interaction events between
        // the two of them.
        dd = new YAHOO.example.DDResize("dd-panel", "dd-resize-handle", "panelresize");
        dd2 = new YAHOO.util.DD("dd-panel", "paneldrag");

        // addInvalidHandleid will make it so a mousedown on the resize handle will 
        // not start a drag on the panel instance.  
        dd2.addInvalidHandleId("dd-resize-handle");
    });
})();

</script>

</textarea>
				</div>
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						<h3 class="firstContent">YUI Logger Output:</h3>
								<div id="loggerDiv"></div>
							<div id="loggerGloss">
								<p><strong>Note:</strong> You are viewing this example in debug mode with logging enabled.  This can significantly slow performance.</p>
	
								<p class="loggerButton"><span id="loggerLink"><span class="first-child"><a href="dd-resize.html">Reload with logging<br />and debugging disabled.</a></span></span></p>
							</div>
						</div>
					
				
					<div id="examples">
						<h3>Drag &amp; Drop Examples:</h3>
	
						<div id="exampleToc">
							<ul>
								<li><a href='../dragdrop/dd-basic.html'>Basic Drag and Drop</a></li><li><a href='../dragdrop/dd-handles.html'>Drag and Drop Handles</a></li><li><a href='../dragdrop/dd-ontop.html'>Drag and Drop with the Dragged Element on Top</a></li><li><a href='../dragdrop/dd-proxy.html'>Drag and Drop using a Proxy Element</a></li><li><a href='../dragdrop/dd-reorder.html'>Using Drag and Drop to Reorder a List</a></li><li><a href='../dragdrop/dd-groups.html'>Drag and Drop Interaction Groups</a></li><li class='selected'><a href='../dragdrop/dd-resize.html'>Drag and Drop - Resizable Panel</a></li><li><a href='../dragdrop/dd-circle.html'>Drag and Drop - Custom Click Validator</a></li>							</ul>
						</div>
					</div>
					
					<div id="module">
						<h3>更多关于拖放控件的资源</h3>
						<ul>
							<li><a href="http://developer.yahoo.com/yui/dragdrop/">用户指南</a> (外部链接)</li>
							<li><a href="../../docs/module_dragdrop.html">API 文档</a></li>
							<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/dragdrop.pdf">备忘录</a> (外部链接)</li>
						</ul>
					</div>
					
	
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